Glow behind reflective text
I have attached a scene for your reference.  



Basically, the scene is straightforward.
A text "G" with reflective and emission material &amp; a wall with white material. Make sure you turn off ambient occlusion in your World Tab as it will throw false lighting in the scene. The wall material is almost completely white, due to the lack of light in the rest of the scene only the backlight is visible.



Hope this helps and is what you are looking for.